Free Thermal Equilibrium and Heat MCQs with Answers
277 Thermal Equilibrium and Heat MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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277 questions · page 14 of 14
- A. 4 g
- B. 40 g
- C. 240 g
- D. 24 g
Explanation: An explanation for this question is given below: We know that P = 100W, t = 5 x 60 = 300s, T = 30 C, and c = 4.2 We will use the formula Q…
Correct answer: 240 g- A. Absorbs
- B. Releases
- C. First absorbs than releases
- D. First releases than absorbs
Explanation: The process of evaporation followed by condensation result in cloud formation.
Correct answer: First absorbs than releases- A. Internal energy
- B. Temperature of a body
- C. Kinetic energy
- D. Heat energy
Explanation: Correct option is D. Heat energy is another name for thermal energy. Its sources are the same as that of heat energy.
Correct answer: Heat energy- A. 700C
- B. 600C
- C. 500C
- D. 400C
Explanation: Since the container has negligible thermal capacity, the heat lost by the hot water (80°C) will be equal to the heat gained by the cold…
Correct answer: 500C- A. 4.98J
- B. 7.98J
- C. 4.l8J
- D. 8.21J
Explanation: One kilocalorie is equal to 4.184 joules so one calorie would be equal to "4.18" joules hence the answer C.
Correct answer: 4.l8J- A. 50%
- B. 40%
- C. 60%
- D. 70%
Explanation: To find the maximum possible efficiency of the steam turbine, we use the Carnot efficiency formula: η = (T1 - T2) / T1, where T1 and T2…
Correct answer: 50%- A. 8314 J mol-1K-1
- B. 83.14 J mol-1K-2
- C. 831.4 J mol-1K-1
- D. 8.314 J mol-1K-1
Explanation: Universal gas constant is 8.314 J mol-1K-1.
Correct answer: 8.314 J mol-1K-1- A. 273.16
- B. 273.16 Q2/Q1
- C. 273.16 Q
- D. 273.16 Q1/Q2
Explanation: 𝑇 1 𝑇 2 = 𝑄1 𝑄2 The triple point of water is 0.01C or 273.16K. Inputting this value as T2 in equation above we get the answer.
Correct answer: 273.16 Q1/Q2- A. 6.21 x 10^-21 J
- B. 5 x 10^-21 J
- C. 6.21 x 10^-12 J
- D. 6 x 10^-21 J
Explanation: The mean translational kinetic energy of an ideal gas is calculated using the formula: K.E.
Correct answer: 6 x 10^-21 J- A. The heat capacity of working substances
- B. Only the temperature of two reservoirs
- C. The reservoir temperature and the heat capacity of working substance
- D. The reservoir temperature and the volume chnage during heat absorption
Explanation: The Carnot engine is a theoretical thermodynamic cycle proposed by Nicolas Léonard Sadi Carnot in 1824.
Correct answer: Only the temperature of two reservoirs- A. The density increases
- B. The latent heat increases
- C. The molecule vibrates more rapidly
- D. The melting point increases
Explanation: The changes that take place when a solid is heated (increase in temperature) are as follows:On increasing the temperature of solids, the…
Correct answer: The molecule vibrates more rapidly- A. Zero
- B. Positive
- C. Negative
- D. None of the above
Explanation: The Carnot Cycle is a thermodynamic cycle that consists of four subsequent reversible processes: isothermal expansion, adiabatic…
Correct answer: Zero- A. Enthalpy is constant
- B. Temperature is constant
- C. Pressure is constant
- D. No heat enters or leaves the system
Explanation: An isothermal change refers to a process in which the temperature of a system remains constant throughout the process.
Correct answer: Temperature is constant- A. Specific heat
- B. Molar specific heat
- C. Heat capacity
- D. Heat of vaporization
Explanation: The amount of heat energy required to raise the temperature of a body through 1 K (or 1 °C) is called:Heat capacity
Correct answer: Heat capacity- A. 775.00 K
- B. 774.85 K
- C. 228.85 K
- D. 228.70 K
Explanation: To convert from Celsius (C) to thermodynamic temperature, also known as Kelvin (K), you can use the formula:Kelvin (K) = Celsius (C) +…
Correct answer: 775.00 K276. The statement that heat cannot spontaneously flow from a colder to a hotter body is a result of:
- A. Henry's law
- B. The first law of thermodynamics
- C. The second law of thermodynamics
- D. The third law of thermodynamics
Explanation: 2nd law of thermodynamics expresses a fundamental and simple truth about the universe, it states that heat cannot flow from colder body to…
Correct answer: The second law of thermodynamics- A. 775.00 K
- B. 774.85 K
- C. 228.85 K
- D. 228.70 K
Explanation: Thermodynamic temperature, by contrast, is an absolute measure of the average total internal energy of an object or objects-namely its…
Correct answer: 775.00 K